SOURCE_FILE@0..18
  FN@0..17
    CONST_KW@0..5 "const"
    WHITESPACE@5..6 " "
    FN_KW@6..8 "fn"
    WHITESPACE@8..9 " "
    NAME@9..12
      IDENT@9..12 "foo"
    PARAM_LIST@12..14
      L_PAREN@12..13 "("
      R_PAREN@13..14 ")"
    WHITESPACE@14..15 " "
    BLOCK_EXPR@15..17
      L_CURLY@15..16 "{"
      R_CURLY@16..17 "}"
  WHITESPACE@17..18 "\n"